[Started scan last night, got a Temp.exe Trojan.Agent, Malwarebytes Quarantined and Removed it, but is it really gone? How much damage could it do?]

Malwarebytes Anti-Malware (PRO) 1.70.0.1100

www.malwarebytes.org

Database version: v2012.12.30.10

Windows 7 Service Pack 1 x64 NTFS

Internet Explorer 9.0.8112.16421

[user] :: [user]-HP [administrator]

Protection: Enabled

12/31/2012 2:18:28 AM

mbam-log-2012-12-31 (02-18-28).txt

Scan type: Full scan (C:\|D:\|)

Scan options enabled: Memory | Startup | Registry | File System | Heuristics/Extra | Heuristics/Shuriken | PUP | PUM

Scan options disabled: P2P

Objects scanned: 965874

Time elapsed: 6 hour(s), 56 minute(s), 49 second(s)

Memory Processes Detected: 0

(No malicious items detected)

Memory Modules Detected: 0

(No malicious items detected)

Registry Keys Detected: 0

(No malicious items detected)

Registry Values Detected: 0

(No malicious items detected)

Registry Data Items Detected: 0

(No malicious items detected)

Folders Detected: 0

(No malicious items detected)

Files Detected: 1

C:\Users\[user]\Templates\Temp.exe (Trojan.Agent) -> Quarantined and deleted successfully.

(end)

So, after the successful quarantine and deletion by Malwarebytes, is it really, actually gone? I've heard of some trojans coming back and starting at boot after removal. How much damage can a trojan do in a night?

I have Malwarebytes Pro and Vipre AntiVirus, and I had a Javascript blocker/filter running on my browser, so I'm unsure how I got it in the first place. I also have Flash Block on as well and am running the latest version of Google Chrome. How could it have gotten through, and how much damage could it possibly do? I've heard that it can steal personal information, but how much could it steal overnight? How would it do so without being detected by either Vipre or Malwarebytes?

How exactly could something get through 3 layers... the Browser and Javascript block, NotScript; Vipre AntiVirus + Vipre's Firewall, and Malwarebytes Pro?

mbam-log-2012-12-31 (02-18-28).txt